MCQ On Biomolecule Class-12 » Chemistry-Papers

What will be the sequence of complimentary strand of DNA if the one strand of DNA has the sequence of TATGACTG?

ATACACTC

ATACTGAC

ATACTGCA

Glucose cannot be classified as ?

Carbohydrate

Aldose

Oligosaccharide

Hexose

Osazone formation involves only 2 carbon atoms of glucose because of

reduction

chelation

oxidation

hydrolysis

Which carbohydrate is used in silvering of mirror?

(A) Sucrose

(B) Fructose

(D) B and C

Vitamin C must be supplied regularly in diet because

it is water soluble hence excreted in urine and can’t be stored in the body

it is water soluble hence used by the body on daily basis and is to be supplied regularly

it is fat soluble hence stored in the body and cannot be used on regular basis

Proteins are the polymers of -amino acids and they are connected to each other by ------

coordinate bond

ionic bond

peptide bond

Which of the following statements is not correct?

Natural proteins are commonly made up of L-isomer of amino acids (D) In -amino acids, - NH2 and

Except glycine, all other amino acids show optical activity

In alpha-amino acids, - NH2 and – COOH groups are attached to different carbon atoms.

The two monosaccharide units obtained on hydrolysis of disaccharide may be

same

different

both

Which one of the following is reducing sugar?

Glycogen

Cellulose

Starch

Fructose

Carbohydrate that cannot be hydrolysed further to give simpler unit of polyhydroxy aldehyde or ketone.

Oligosaccharide

Polysaccharide

Monosaccharide

Fehling’s solution test is given by

lactose

all of these

fructose

glucose

The pair of compounds in which both the compounds give positive test with Tollen’s reagent is

fructose and sucrose

glucose and sucrose

glucose and fructose

Find out the correct option among the following statements.

Maltose and lactose are non-reducing sugar

All monosaccharides whether aldoses or ketoses are reducing sugar

In reducing sugars, aldehydic and ketone group are free bonded

Fehling’s solution and Tollen’s reagent are non-reducing sugar

Deficiency of biotin causes dermatitis and paralysis, biotin is also known as

vitamin D

vitamin B12

vitamin H

D-Glucose and L-Glucose are

enantiomers

anomers

diastereomers

epimers

Deficiency of vitamin E causes

Muscular weakness

Sterility Anaemia

Scurvy

Molisch’s test reagent is

both

5% solution of α-Napthol in alcohol and few droplets of conc. H2SO4

1% of β-Napthol in alcohol

Which is a fat soluble vitamin?

Vitamin B6

Vitamin C

Vitamin A

How many number of water molecules are removed from the n number of amino acids during the formation of peptide bond?

(n – 3)

(n – 1)

(n – 2)

How many amino acids (approximately) are involved during the synthesis of protein?

Biuret test is used for

Proteins

Fats

Sugar

Fructose reduce Tollen’s reagent due to

enolisation of fructose followed by conversion of aldehyde by base

primary alcoholic group

secondary alcoholic group

Which of the following is the correct statement?

Starch is a polymer of α-glucose

Amylose is not a component of starch

Proteins are composed of only one type of amino acid

Carbohydrates have

All

–CHO group

> C = O group

–OH group

Select the base which is not common in DNA and RNA.

Guanine (B)

Adenine (A)

Cytosine (C)

Uracil (U)

In iodine test of starch which colour of ppt had been observed

blue

black

red

Identify the pair of epimers

D-glucose and D-fructose

D-glucose and L-glucose

D-glucose and D-mannose

Which one of the following is non-reducing sugar?

Fructose

Maltose

Sucrose

Glucose

Which of the following vitamins is water soluble?

Riboflavin

Vitamin D

Vitamin E

Vitamin A is present in-

butter

milk

fish liver oil

all of these

Guanine is an example of

a nucleotide

a nucleoside

a nitrogenous base

Reduction of hexose A (molecular formula C6H12O6) with sodium borohydride gives compound B and C. Compound B is optically inactive, whereas compound C is optically active . Which of the following is compound A?

D-fructose

D-glucose

D-mannose

D-galactose

Phosphodiester linkage is present between which carbon atoms of pentose sugars of nucleotides?

3’ and 3’

5’ and 5’

5’ and 3’

1’ and 5’

Millon’s test is given by

ester